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LMX2487E

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3-GHz to 7.5-GHz delta-sigma low power dual PLL for RF personal communications

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Data sheet

LMX2487E

ACTIVE
Data sheet Order now

Product details

Integrated VCO No Output frequency (min) (MHz) 3000 Output frequency (max) (MHz) 7500 Normalized PLL phase noise (dBc/Hz) -210 Current consumption (mA) 5.7 Features Advanced delta-sigma fractional compensation, Cycle slip reduction, Dual PLL, Fastlock, Integrated timeout counter, On-chip input frequency doubler 1/f noise (10-kHz offset at 1-GHz carrier) (dBc/Hz) -104 Rating Catalog Operating temperature range (°C) -40 to 85 Lock time (µs) (typ) Loop BW dependent
Integrated VCO No Output frequency (min) (MHz) 3000 Output frequency (max) (MHz) 7500 Normalized PLL phase noise (dBc/Hz) -210 Current consumption (mA) 5.7 Features Advanced delta-sigma fractional compensation, Cycle slip reduction, Dual PLL, Fastlock, Integrated timeout counter, On-chip input frequency doubler 1/f noise (10-kHz offset at 1-GHz carrier) (dBc/Hz) -104 Rating Catalog Operating temperature range (°C) -40 to 85 Lock time (µs) (typ) Loop BW dependent
WQFN (RTW) 24 16 mm² 4 x 4
  • Quadruple Modulus Prescaler for Lower Divids
    • RF PLL: 16/17/20/21 or 32/33/36/37
    • IF PLL: 8/9 or 16/17
  • Advanced Delta Sigma Fractional Compensation
    • 12-Bit or 22-Bit Selectable Fractional Modulus
    • Up to 4th Order Programmable Delta-Sigma
      Modulator
  • Features for Improved Lock Time
    • Fastlock / Cycle Slip Reduction that Requires
      Single-Word Write
    • Integrated Time-Out Counter
  • Wide Operating Range
    • LMX2487E RF PLL: 3.0 GHz to 7.5 GHz
  • Useful Features
    • Digital Lock Detect Output
    • Hardware and Software Power-Down Control
    • On-Chip Crystal Reference Frequency Doubler
    • RF Phase Comparison Frequency Up to 50
      MHz
    • 2.5-V to 3.6-V Operation With ICC = 8.5 mA
      at 3.0 V
  • Quadruple Modulus Prescaler for Lower Divids
    • RF PLL: 16/17/20/21 or 32/33/36/37
    • IF PLL: 8/9 or 16/17
  • Advanced Delta Sigma Fractional Compensation
    • 12-Bit or 22-Bit Selectable Fractional Modulus
    • Up to 4th Order Programmable Delta-Sigma
      Modulator
  • Features for Improved Lock Time
    • Fastlock / Cycle Slip Reduction that Requires
      Single-Word Write
    • Integrated Time-Out Counter
  • Wide Operating Range
    • LMX2487E RF PLL: 3.0 GHz to 7.5 GHz
  • Useful Features
    • Digital Lock Detect Output
    • Hardware and Software Power-Down Control
    • On-Chip Crystal Reference Frequency Doubler
    • RF Phase Comparison Frequency Up to 50
      MHz
    • 2.5-V to 3.6-V Operation With ICC = 8.5 mA
      at 3.0 V

The LMX2487E device is a low power, high performance delta-sigma fractional-N PLL with an auxiliary integer-N PLL. It is fabricated using TI’s advanced process.

With delta-sigma architecture, fractional spurs at lower offset frequencies are pushed to higher frequencies outside the loop bandwidth. The ability to push close in spur and phase noise energy to higher frequencies is a direct function of the modulator order. Unlike analog compensation, the digital feedback technique used in the LMX2487E is highly resistant to changes in temperature and variations in wafer processing. The LMX2487E delta-sigma modulator is programmable up to fourth order, which allows the designer to select the optimum modulator order to fit the phase noise, spur, and lock time requirements of the system.

Serial data for programming the LMX2487E is transferred through a three-line, high-speed (20-MHz) MICROWIRE interface. The LMX2487E offers fine frequency resolution, low spurs, fast programming speed, and a single-word write to change the frequency. This makes it ideal for direct digital modulation applications, where the N-counter is directly modulated with information. The LMX2487E is available in a 24-lead 4.0 × 4.0 × 0.8 mm WQFN package.

The LMX2487E device is a low power, high performance delta-sigma fractional-N PLL with an auxiliary integer-N PLL. It is fabricated using TI’s advanced process.

With delta-sigma architecture, fractional spurs at lower offset frequencies are pushed to higher frequencies outside the loop bandwidth. The ability to push close in spur and phase noise energy to higher frequencies is a direct function of the modulator order. Unlike analog compensation, the digital feedback technique used in the LMX2487E is highly resistant to changes in temperature and variations in wafer processing. The LMX2487E delta-sigma modulator is programmable up to fourth order, which allows the designer to select the optimum modulator order to fit the phase noise, spur, and lock time requirements of the system.

Serial data for programming the LMX2487E is transferred through a three-line, high-speed (20-MHz) MICROWIRE interface. The LMX2487E offers fine frequency resolution, low spurs, fast programming speed, and a single-word write to change the frequency. This makes it ideal for direct digital modulation applications, where the N-counter is directly modulated with information. The LMX2487E is available in a 24-lead 4.0 × 4.0 × 0.8 mm WQFN package.
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Technical documentation

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Type Title Date
* Data sheet LMX2487E 7.5-GHz, High-Performance, Delta-Sigma Low-Power Dual PLLatinum Frequency Synthesizers With 3-GHz Integer PLL datasheet (Rev. B) PDF | HTML 13 Jan 2016
EVM User's guide LMX248x Evaluation Board User's Guide (Rev. B) 27 Jul 2018

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

LMX2487E-EVM — LMX2487E Evaluation Module

The LMX2487E Evaluation Board simplifies evaluation of the LMX2487E 7.5 GHz PLLatinumTM dual frequency synthesizer. The board enables all performance measurements with no additional support circuitry. The evaluation board consists of a LMX2485 device, a RF VCO module and IF VCO & RF/IF loop (...)

User guide: PDF
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Application software & framework

CLOCKDESIGNTOOL — Clock Design Tool - Loop Filter & Device Configuration + Simulation

The Clock Design Tool software helps with part selection, loop filter design and simulation of timing device solutions. When you enter desired output frequencies and a reference frequency (optional), the tool provides TI devices to meet the specified requirements, divider values and a recommended (...)
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Application software & framework

PLLATINUMSIM-SW — Texas Instruments PLLatinum Simulator Tool

PLLATINUMSIM-SW is a simulation tool that allows users to create detailed designs and simulations of our PLLatinum™ integrated circuits, which include the LMX series of phase-locked loops (PLLs) and synthesizers.
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Application software & framework

TICSPRO-SW — Texas Instruments Clocks and Synthesizers (TICS) Pro Software

Texas Instruments clocks and synthesizers (TICS) pro software is used to program the evaluation modules (EVMs) for product numbers with these prefixes: CDC, LMK and LMX. These products include phase-locked loops and voltage-controlled oscillators (PLL+VCO), synthesizers and clocking devices.
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IDE, configuration, compiler or debugger

CODELOADER — CodeLoader Software for device register programming

The CodeLoader 4 software is used to program the LMX PLLs and LMK timing devices through either the USB or line print terminal (LPT) port of a computer. This software also provides information on how to program the device by showing the bits that are actually sent.

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Design tool

CLOCK-TREE-ARCHITECT — Clock tree architect programming software

Clock tree architect is a clock tree synthesis tool that streamlines your design process by generating clock tree solutions based on your system requirements. The tool pulls data from an extensive database of clocking products to generate a system-level multi-chip clocking solution.
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WQFN (RTW) 24 View options

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